Features: METRIC MAGNETIC NUT DRIVER KIT INCLUDES:14mm,13mm,12mm,11mm,10mm,9mm,8mm, 7mm, 6mm HIGH QUALITY: The impact driver bit set is made of Cr-V steel, which has higher shock resistance and hardness up to 52±2 HRC; blackened with manganese phosphate to make it more durable. The quick change chuck socket wrench screw impact nutsetter gives you a thumbs up. POWERFUL MAGNETISM: Each magnet is installed tightly, no magnet will fall off, the nut is adsorbed in the sleeve, you can work easily and happily. APPLICATION: The universal 1/4 inch hexagonal shank, suitable for quick change chuck and any drill or driver, electric screwdriver, socket wrench, pneumatic impact wrench, cordless drill, screw gun, etc. MULTI-FUNCTION:Widely used in home DIY , woodworking, mechanical repair, etc.